It was probably true at some point, then malicious people learned how to fake stupidity and they outnumber actual stupid people, and they learned how to recruit stupid people to their causes.

Or it's being spread by the malicious actors, like "money doesn't buy happiness".

It's a decent rule for when one of your close friends breaks your favorite mug. Not so much for complete strangers, not to mention faceless mega-corporations, making choices to fuck you over.